I use this:
https://addons.mozilla.org/en-US/fir.../adblock-plus/
This is probably the best program I've ever downloaded. After setting it up about 90% of the ads were gone... I didn't even have ads interrupting the beginning of youtube videos! As you go through various websites you can open the adblockplus engine and block individual things that carryover to other sites. It's almost infinitely adjustable!
Sometimes I come to ecomodder on my iPad... just to see what's different and where the ads are placed.
This is the only ad type thing I see right now through my desktop...
I think I'll leave it there.